Paper explains the concepts of art creation and creativity and their connection with the expression of children's emotions while creating art works. In today's time, it is increasingly difficult for children to express their emotions in words, so in this paper the goal was to emphasize that art drawing can be used as a means of communication. An attempt was made to point out the importance of encouraging children's creativity and to describe the developmental stages of children's artistic expression. The paper wanted to emphasize the important role of educators in encouraging children's artistic creativity. The environment should provide appropriate incentives and be ready to accept changes, and therefore children's works if they are different from what was expected. The concept of art therapy and its implementation in the Republic of Croatia are explained. A therapy that is specific from other therapies in that it includes the expression of emotions, interests and concerns through various creative media (music, dance, acting, drawing ...). In the art activities in the institution of early and preschool upbringing and education, a lot of children's works were collected in order to see the correlation between the expression of emotions and artistic creativity. We wanted to determine whether there is a connection between colors and lines and the expression of children's emotions. Music, photos of artistic paintings and picture books were used as an incentive to express children's emotions using art techniques (felt pens, tempera, pastels). Six teachers and three educational groups participated in art activities. The art works were created by children between the ages of four and seven, which were later analyzed and accompanied by the children's comments.